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Comparison of genetic trend of dairy cattle among different models in Korea.

Abstract

Since 1995, the national genetic evaluation for dairy cattle using animal model has been under taken in Korea. The main goal of national genetic evaluation is accurate selection of bulls and cows, which have good genetic potentials both production and conformation traits. For more than 20 years, the milk recording program has been run and hundreds of thousands of data were accumulated at present. However, it is appeared that a lot of data is inappropriate for genetic evaluation. The inadequateness was mainly caused by small herd size, shortage of repeated records and loss of records including pedigree records. The aim of this study was to select proper model using data, which includes some inadequate data, by comparison of genetic trend among models